spectrum

From Wiktionary
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Pronunciation[change]

Noun[change]

Singular
spectrum

Plural
spectra or spectrums

A spectrum of colors
  1. A range.
  2. Specifically, a range of colors representing light of various frequencies.
  3. (chemistry) The pattern of absorption or emission of radiation that is made by a substance when it is put in contact with an energy such as radiation, heat, electricity, etc.